which team had the lowest era between 1970 to 1990

Between the 1970 and 1990 seasons, the Los Angeles Dodgers had the lowest ERA by a team, with an ERA of 3.23.

	TEAM	ERA	G	W%	W	L	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Dodgers	3.23	3,342	.545	1,821	1,518	3,342	19,307	761	274	693	30193.1	27,611	10,836	12,339	2,202	9,834	508	1,049	125,871	868	5.76	2.93	1.96	0.66	15.3	7.8	1.24	.270	3.68	8.23
2	Mets	3.45	3,337	.501	1,670	1,664	3,337	20,193	588	176	731	30040.2	27,942	11,506	13,011	2,322	10,741	547	1,279	126,379	863	6.05	3.22	1.88	0.70	16.0	8.5	1.29	.277	3.90	8.37
3	Astros	3.51	3,342	.505	1,687	1,654	3,342	19,112	656	202	686	30075.0	27,955	11,743	13,214	2,104	11,127	631	1,057	127,048	1,109	5.72	3.33	1.72	0.63	15.0	8.8	1.30	.275	3.95	8.37
4	Pirates	3.53	3,334	.523	1,743	1,587	3,334	17,983	576	153	814	30084.2	28,669	11,784	13,314	2,330	10,654	574	1,389	127,075	940	5.38	3.19	1.69	0.70	14.2	8.4	1.31	.276	3.98	8.58
5	Cardinals	3.61	3,340	.508	1,695	1,639	3,340	16,662	632	181	698	30091.1	29,079	12,059	13,596	2,124	10,846	525	1,592	127,267	999	4.98	3.24	1.54	0.64	13.1	8.5	1.33	.278	4.07	8.70
6	Expos	3.62	3,338	.493	1,644	1,691	3,338	18,287	583	174	760	30041.2	28,442	12,087	13,590	2,418	11,258	624	1,215	127,262	962	5.48	3.37	1.62	0.72	14.4	8.8	1.32	.275	4.07	8.52
7	Yankees	3.67	3,332	.544	1,813	1,518	3,332	16,951	738	158	803	29840.0	29,108	12,153	13,629	2,607	10,039	519	768	125,917	897	5.11	3.03	1.69	0.79	13.5	8.0	1.31	.277	4.11	8.78
8	Orioles	3.67	3,323	.548	1,820	1,502	3,323	15,873	929	201	638	29792.2	28,690	12,136	13,386	2,770	10,196	440	818	125,059	827	4.80	3.08	1.56	0.84	12.7	8.2	1.31	.271	4.04	8.67
9	Athletics	3.67	3,339	.522	1,744	1,595	3,339	16,923	741	150	761	29963.2	28,359	12,218	13,827	2,735	11,238	641	763	127,206	1,026	5.08	3.38	1.51	0.82	13.3	8.8	1.32	.268	4.15	8.52
10	Reds	3.68	3,339	.547	1,825	1,511	3,339	18,078	523	149	847	30032.0	28,715	12,274	13,594	2,568	10,980	478	1,414	127,098	825	5.42	3.29	1.65	0.77	14.2	8.6	1.32	.275	4.07	8.61
11	Giants	3.69	3,342	.494	1,652	1,690	3,342	17,649	540	147	732	30009.0	29,312	12,310	14,093	2,428	10,891	576	1,539	128,050	984	5.29	3.27	1.62	0.73	13.8	8.5	1.34	.279	4.23	8.79
12	Royals	3.72	3,333	.526	1,752	1,580	3,333	16,221	714	169	728	29784.0	29,278	12,301	13,855	2,378	10,228	647	834	126,328	892	4.90	3.09	1.59	0.72	12.8	8.1	1.33	.278	4.19	8.85
13	Padres	3.74	3,340	.451	1,504	1,834	3,340	17,135	521	142	698	29974.2	29,308	12,468	14,165	2,582	11,406	542	1,553	128,087	889	5.14	3.42	1.50	0.78	13.4	8.9	1.36	.277	4.25	8.80
14	Phillies	3.78	3,342	.501	1,672	1,666	3,342	18,609	578	133	689	29952.2	29,217	12,592	14,117	2,457	11,097	565	1,401	127,472	1,020	5.59	3.33	1.68	0.74	14.6	8.7	1.35	.282	4.24	8.78
15	Angels	3.79	3,341	.492	1,644	1,696	3,341	18,088	833	186	608	30006.2	29,025	12,622	14,177	2,669	11,336	738	886	127,641	994	5.43	3.40	1.60	0.80	14.2	8.9	1.35	.278	4.25	8.71
16	Rangers	3.89	3,332	.466	1,550	1,778	3,332	17,936	726	156	601	29770.1	29,036	12,875	14,626	2,662	11,551	808	926	127,468	1,066	5.42	3.49	1.55	0.80	14.1	9.1	1.36	.279	4.42	8.78
17	Tigers	3.92	3,338	.512	1,707	1,630	3,338	17,694	810	144	657	29832.1	29,024	13,006	14,502	3,049	11,410	706	1,097	127,445	1,074	5.34	3.44	1.55	0.92	13.9	9.0	1.36	.275	4.38	8.76
18	White Sox	3.94	3,333	.482	1,604	1,723	3,333	17,055	657	135	796	29717.2	29,434	13,021	14,627	2,587	11,128	750	667	127,246	901	5.17	3.37	1.53	0.78	13.4	8.7	1.36	.280	4.43	8.91
19	Brewers	3.94	3,339	.484	1,616	1,721	3,339	15,315	736	152	724	29789.2	30,304	13,055	14,638	2,785	10,433	632	949	127,483	918	4.63	3.15	1.47	0.84	12.0	8.2	1.37	.280	4.42	9.16
20	Red Sox	3.95	3,335	.541	1,804	1,530	3,335	17,797	837	180	691	29820.0	30,568	13,085	14,595	2,885	10,221	700	871	127,658	743	5.37	3.08	1.74	0.87	13.9	8.0	1.37	.288	4.40	9.23
21	Cubs	3.97	3,336	.480	1,597	1,733	3,336	18,250	511	137	776	29902.1	30,733	13,185	14,799	2,579	10,578	599	1,521	128,484	941	5.49	3.18	1.73	0.78	14.2	8.2	1.38	.292	4.45	9.25
22	Braves	4.01	3,332	.451	1,502	1,825	3,332	17,112	537	120	684	29759.2	30,153	13,244	15,029	2,690	11,167	631	1,256	128,304	989	5.18	3.38	1.53	0.81	13.3	8.7	1.39	.284	4.55	9.12
23	Blue Jays	4.02	2,211	.484	1,069	1,140	2,211	11,318	382	73	452	19795.0	19,678	8,836	9,778	1,959	7,370	481	573	84,575	639	5.15	3.35	1.54	0.89	13.4	8.7	1.37	.279	4.45	8.95
24	Twins	4.03	3,336	.486	1,619	1,715	3,336	17,086	669	123	698	29721.0	30,154	13,302	14,882	2,933	10,698	702	764	127,170	941	5.17	3.24	1.60	0.89	13.4	8.4	1.37	.284	4.51	9.13
25	Indians	4.18	3,326	.458	1,524	1,800	3,326	17,218	681	134	662	29712.2	30,044	13,795	15,346	2,873	11,590	720	1,018	128,279	1,065	5.22	3.51	1.49	0.87	13.4	9.0	1.40	.283	4.65	9.10